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Henneth Annûn was a hidden Gondorian outpost in North Ithilien. During the War of the Ring, Faramir son of Steward Denethor II had his base of operations there, and Frodo Baggins and Samwise Gamgee were taken there by his company.
This secret dwelling consisted of a cave behind a west-facing waterfall overlooking a pool. The cave had been excavated by the stream feeding the waterfall, which originally fell from the hole in the cliff constituting the window in the name, but that stream had since been diverted and the tunnel sealed save for a concealed entrance.
Henneth Annûn means "Window of the Sunset" in Sindarin.